web_logger/
lib.rs

1//! A logger that prints all messages in browser's console.
2
3extern crate log;
4#[macro_use]
5extern crate stdweb;
6
7use log::{
8    Log,
9    Level,
10    Metadata,
11    Record,
12    SetLoggerError,
13};
14
15mod console {
16    pub(super) fn trace(message: &str) {
17        js! { @(no_return) console.log(@{message}); }
18    }
19
20    pub(super) fn debug(message: &str) {
21        js! { @(no_return) console.debug(@{message}); }
22    }
23
24    pub(super) fn info(message: &str) {
25        js! { @(no_return) console.info(@{message}); }
26    }
27
28    pub(super) fn warn(message: &str) {
29        js! { @(no_return) console.warn(@{message}); }
30    }
31
32    pub(super) fn error(message: &str) {
33        js! { @(no_return) console.error(@{message}); }
34    }
35}
36
37
38pub struct Config {
39    pub level: Level
40}
41
42impl Default for Config {
43    fn default() -> Self {
44        Config {
45            level: Level::Trace
46        }
47    }
48}
49
50
51static LOGGER: WebLogger = WebLogger;
52
53struct WebLogger;
54
55impl Log for WebLogger {
56    fn enabled(&self, _metadata: &Metadata) -> bool {
57        // TODO Check the args of a location
58        true
59    }
60
61    fn log(&self, record: &Record) {
62        let metadata = record.metadata();
63        if self.enabled(metadata) {
64            let msg = format!("{}:{} -- {}",
65                record.level(),
66                record.target(),
67                record.args());
68            match metadata.level() {
69                Level::Trace => console::trace(&msg),
70                Level::Debug => console::debug(&msg),
71                Level::Info => console::info(&msg),
72                Level::Warn => console::warn(&msg),
73                Level::Error => console::error(&msg),
74            }
75        }
76    }
77
78    fn flush(&self) {
79    }
80}
81
82pub fn try_init(config: Config) -> Result<(), SetLoggerError> {
83    log::set_logger(&LOGGER)?;
84    let level = config.level;
85    log::set_max_level(level.to_level_filter());
86    Ok(())
87}
88
89pub fn init() {
90    try_init(Config::default()).expect("web_logger::init should not be called after logger initialized");
91}
92
93pub fn custom_init(config: Config) {
94    try_init(config).expect("web_logger::custom_init should not be called after logger initialized");
95}
web_logger/lib.rs

web_logger/
lib.rs
